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Muscle Assignment

Attached to bones or, for some facial muscles, to skin Skeletal
Walls of the heart Cardiac
Mostly in walls of hollow visceral organs (other than the heart) Smooth
Skeletal and smooth muscle cells are elongated Muscle fibers
Packaged into the organs called skeletal muscles that attach to the body's skeleton Skeletal muscle fibers
Another name for skeletal muscle Striated muscle
Are skeletal muscles voluntary or involuntary? Voluntary
Encloses each muscle fiber in a delicate connective tissue sheath Endomysium
Several sheathed muscle fibers that are wrapped by a coarser fibrous membrane Perimysium
Many fascicles that are bound together by an even tougher "overcoat" of connective tissue Epimysium
Attaches muscles indirectly to bones, cartilages, or connective tissue coverings Aponeuroses
Tough collagenic fibers, so they can cross rough bony projections, which would tear the more delicate muscle tissue Tendons
Muscle consisting of spindle-shaped, unstriped (nonstriated) muscle cells Smooth muscle
Are smooth muscle voluntary or involuntary Involuntary
Found only in the heart Cardiac muscle
Is cardiac muscle voluntary or involuntary? Involuntary
What cushions the cardiac cells by small amounts of soft connective tissue Endomysium
Branching cells joined by a special junction Cardiac muscle fibers
All the movements of the human body result from what? Muscle contraction
Why are muscle tendons important? Reinforcing and stabilizing joins that have poorly fitting articulating surfaces
What do skeletal muscles protect? Fragile internal organs
Contractile organelles found in the cytoplasm of muscle cells Myofibrils
The smallest contractile unit of muscle; extends from one Z disc to the next Sarcomere
Filaments composing the myofibrils Myofilament
Two types of myofilament Actin and myosin
Larger thick filaments Myosin filaments
One of the principal contractile proteins found in muscle Myosin
A contractile protein Actin
Neuron process that carries impulses away from the nerve cell body Axon
The region where a motor neuron comes into close contract with a skeletal muscle cell. Neuromuscular Junction
Chemical released by neurons that may stimulate or inhibit them Neurotransmitter
The ability to shorten Contractility
To respond to stimulus Excitability
To be stretched Extensibility
The ability to recoil and resume their resting length after being stretched Elasticity
A bundle of nerve or muscle fibers bound together by connective tissue Fasciculi
What's the function of a neuromuscular junction? Stimulates skeletal muscle cells with neurotransmitters
Thick filaments of muscle fibers slide past thin filaments during muscle contraction, while these groups remain at constant length. Sliding filament mechanism of muscle contraction
A single rapid contraction of a muscle Muscle twitch
When the muscle goes into uncontrollable spasms. Muscle tetany
A sustained partial contraction of a muscle in response to stretch receptor inputs and keeps the muscle healthy. Muscle tone
Attachment of a muscle that remains relatively fixed during muscular contraction. Origin
The movable attachment of a muscle as opposed to its origin Insertion
Muscles cooperating with another muscle or muscle group to produce a desired movement. Synergist
Muscles that act in opposition to an agonist or prime mover Antagonists
Muscle whose contractions are primarily responsible for particular movement. Prime Mover
Attach the tongue to other structures Extrinsic tongue muscles
Lies entirely within the tongue Intrinsic tongue muscles
The fine transparent tubular sheath which envelops the fibers of skeletal muscles. Sarcolemma
A membrane-bound structure found within muscle cells. Sarcoplasmic Reticulum
A motor neuron and all the muscle cells it supplies. Motor unit
A chemical transmitter substance released by certain nerve endings. Acetylcholine
A symptom that decreases your muscles’ ability to perform over time. Muscle fatigue
The movable attachment of a muscle as opposed to its origin. Insertion
Single, very long, cylindrical, multinucleate cells with very obvious striations Skeletal
Branching chains of cells; uninucleate, striations; intercalated discs Cardiac
Single, fusiform, uninucleate; no striations Smooth
The product of anaerobic metabolism, especially in muscle Lactic acid
Soft and flabby skin muscle Flaccid
Reduction in size or wasting away of an organ or cell resulting from disease or lack of use Atrophy
Type of exercise that helps blood supply in the muscles increase Aerobic
Decreases the angle of the joint and brings two bones closer together Flexion
Increases the angle or distances between two bones or parts of the body Extension
A movement of a bone around its longitudinal axis Rotation
Moving a limb away from the body Abduction
Moving a limb towards the body Adduction
The proximal end of the limb is stationary, and its distal end in a circle Circumduction
Up-and-down movements of the foot at the ankle Dorsiflexion and plantar flexion
To invert and evert the foot Inversion and eversion
The movements of the radius around the ulna. Supination and pronation
The action by which the thumb is used to touch the tips of the other fingers on the same hand Opposition
The action of a muscle can be inferred by the muscle's position as it crosses a joint Muscle action
Rectus, oblique, etc Direction of the muscle fibers
Maximus, minimus, longus, etc. Relative size of the muscle
Temporalis and frontalis Location of the muscle
Created by: rofrale1
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